Compact liquid crystal waveguide based Fourier transform spectrometer for in-situ and remote gas and chemical sensing

Tien-Hsin Chao; Thomas T. Lu; Scott R. Davis; Scott D. Rommel; George Farca; Ben Luey; Alan Martin; Michael H. Anderson

doi:10.1117/12.785888

17 March 2008 Compact liquid crystal waveguide based Fourier transform spectrometer for in-situ and remote gas and chemical sensing

Tien-Hsin Chao, Thomas T. Lu, Scott R. Davis, Scott D. Rommel, George Farca, Ben Luey, Alan Martin, Michael H. Anderson

Author Affiliations +

Proceedings Volume 6977, Optical Pattern Recognition XIX; 69770P (2008) https://doi.org/10.1117/12.785888
Event: SPIE Defense and Security Symposium, 2008, Orlando, Florida, United States

Abstract

Vescent Photonics Inc. and Jet Propulsion Lab are jointly developing an innovative ultra-compact (volume < 10 cm³), ultra-low power (<10^-3 Watt-hours per measurement and zero power consumption when not measuring), completely non-mechanical electro-optic Fourier transform spectrometers (EO-FTS) that will be suitable for a variety of remoteplatform, in-situ measurements. These devices are made possible by a novel electro-evanescent waveguide architecture, enabling "chip-scale" EO-FTS sensors. The potential performance of these EO-FTS sensors include: i) a spectral range throughout 0.4-5 μm (25000 - 2000 cm^-1), ii) high-resolution (▵λ≤ 0.1 nm), iii) high-speed (< 1 ms) measurements, and iv) rugged integrated optical construction. This performance potential enables the detection and quantification of a large number of different atmospheric gases simultaneously in the same air mass and the rugged construction will enable deployment on previously inaccessible platforms. The sensor construction is also amenable for analyzing aqueous samples on remote floating or submerged platforms. To date a proof-of-principle prototype EO-FTS sensor has been demonstrated in the near-IR (range of 1450-1700 nm) with a 5 nm resolution. This performance is in good agreement with theoretical models, which are being used to design and build the next generation of EO-FTS devices.

Citation Download Citation

Tien-Hsin Chao, Thomas T. Lu, Scott R. Davis, Scott D. Rommel, George Farca, Ben Luey, Alan Martin, and Michael H. Anderson "Compact liquid crystal waveguide based Fourier transform spectrometer for in-situ and remote gas and chemical sensing", Proc. SPIE 6977, Optical Pattern Recognition XIX, 69770P (17 March 2008); https://doi.org/10.1117/12.785888

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